Synonyms and related words :
antic, arch, devilish, elfish, elvish, foolish, full of mischief, high-spirited, impish, knavish, larkish, mischief-loving, mischievous, playful, prankish, pranksome, pranky, roguish, scampish, scapegrace, sportive, trickish, tricksy, waggish, wicked